@article{SotiropoulouGibsonGafos2020,
  author    = {Sotiropoulou, Stavroula and Gibson, Mark and Gafos, Adamantios I.},
  title     = {Global organization in Spanish onsets},
  series = {Journal of phonetics},
  volume    = {82},
  journal   = {Journal of phonetics},
  publisher = {Elsevier},
  address   = {London},
  issn      = {0095-4470},
  doi       = {10.1016/j.wocn.2020.100995},
  pages     = {22},
  year      = {2020},
  abstract  = {This paper addresses the relation between syllable structure and inter-segmental temporal coordination. The data examined are Electromagnetic Articulometry recordings from six speakers of Central Peninsular Spanish (henceforth, Spanish), producing words beginning with the clusters /pl, bl, kl, gl, p(sic), k(sic), t(sic)/ as well as corresponding unclustered sonorant-initial words in three vowel contexts /a, e, o/. In our results, we find evidence for a global organization of the segments involved in these combinations. This is reflected in a number of ways: shortening of the prevocalic sonorant in the cluster-initial case compared to the unclustered case, reorganization of the relative timing of the internal CV subsequence (in a CCV) in the obstruent-lateral context, early vowel initiation, and a strong compensatory relation between the duration of the obstruent-to-lateral transition and the duration of the lateral. In other words, we find that the global organization presiding over the segments partaking in these tautosyllabic CCVs is pleiotropic, that is, simultaneously expressed over a set of different phonetic parameters rather than via a privileged metric such as c-center stability or any other such given single measure (employed in prior works).},
  language  = {en}
}
@article{SotiropoulouGafos2022,
  author    = {Sotiropoulou, Stavroula and Gafos, Adamantios I.},
  title     = {Phonetic indices of syllabic organization in German stop-lateral clusters},
  series = {Laboratory Phonology},
  volume    = {13},
  journal   = {Laboratory Phonology},
  number    = {1},
  publisher = {Open Library of humanities},
  address   = {Cambridge},
  issn      = {1868-6346},
  doi       = {10.16995/labphon.6440},
  pages     = {42},
  year      = {2022},
  abstract  = {Using articulatory data from five German speakers, we study how segmental sequences under different syllabic organizations respond to perturbations of phonetic parameters in the segments that compose them. Target words contained stop-lateral sequences /bl, gl, kl, pl/ in word-initial and cross-word contexts and were embedded in carrier phrases with different prosodic boundaries, i.e., no phrase boundary versus an utterance phrase boundary preceded the target word in the case of word-initial clusters, or separated the consonants in the case of cross-word sequences. For word-initial cluster (CCV) onsets, we find that increasing C1 stop duration or the lag between two consonants leads to earlier vowel initiation and reduced local timing stability across CV, CCV. Furthermore, as the inter-consonantal lag increases, C2 duration decreases. In contrast, for cross-word C\#CV sequences, increasing inter-consonantal lag does not lead to earlier vowel initiation and robust local timing stability is maintained across CV, C\#CV. In other words, in CCV sequences within words, local perturbations to segments have effects that ripple through the rest of the sequence. Instead, in cross-word C\#CV sequences, local perturbations stay local. Overall, the findings indicate that the effects of phonetic perturbations on coordination patterns depend on the syllabic organization superimposed on these clusters.},
  language  = {en}
}
@phdthesis{Sotiropoulou2019,
  author    = {Sotiropoulou, Stavroula},
  title     = {Pleiotropy of phonetic indices in the expression of syllabic organization},
  doi       = {10.25932/publishup-54639},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-546399},
  school      = {Universit{\"a}t Potsdam},
  pages     = {xv, 184},
  year      = {2019},
  abstract  = {This dissertation is concerned with the relation between qualitative phonological organization in the form of syllabic structure and continuous phonetics, that is, the spatial and temporal dimensions of vocal tract action that express syllabic structure. The main claim of the dissertation is twofold. First, we argue that syllabic organization exerts multiple effects on the spatio-temporal properties of the segments that partake in that organization. That is, there is no unique or privileged exponent of syllabic organization. Rather, syllabic organization is expressed in a pleiotropy of phonetic indices. Second, we claim that a better understanding of the relation between qualitative phonological organization and continuous phonetics is reached when one considers how the string of segments (over which the nature of the phonological organization is assessed) responds to perturbations (scaling of phonetic variables) of localized properties (such as durations) within that string. Specifically, variation in phonetic variables and more specifically prosodic variation is a crucial key to understanding the nature of the link between (phonological) syllabic organization and the phonetic spatio-temporal manifestation of that organization. The effects of prosodic variation on segmental properties and on the overlap between the segments, we argue, offer the right pathway to discover patterns related to syllabic organization. In our approach, to uncover evidence for global organization, the sequence of segments partaking in that organization as well as properties of these segments or their relations with one another must be somehow locally varied. The consequences of such variation on the rest of the sequence can then be used to unveil the span of organization. When local perturbations to segments or relations between adjacent segments have effects that ripple through the rest of the sequence, this is evidence that organization is global. If instead local perturbations stay local with no consequences for the rest of the whole, this indicates that organization is local.},
  language  = {en}
}
@article{LialiouSotiropoulouGafos2021,
  author    = {Lialiou, Maria and Sotiropoulou, Stavroula and Gafos, Adamantios I.},
  title     = {Spatiotemporal coordination in word-medial stop-lateral and s-stop clusters of American English},
  series = {Phonetica : international journal of phonetic science},
  volume    = {78},
  journal   = {Phonetica : international journal of phonetic science},
  number    = {5-6},
  publisher = {De Gruyter Mouton},
  address   = {Berlin},
  issn      = {0031-8388},
  doi       = {10.1515/phon-2021-2010},
  pages     = {385 -- 433},
  year      = {2021},
  abstract  = {This paper is concerned with the relation between syllabic organization and intersegmental spatiotemporal coordination using Electromagnetic Articulometry recordings from seven speakers of American English (henceforth, English). Whereas previous work on English has focused on word-initial clusters (preceding a vowel whose identity was not systematically varied), the present work examined word-medial clusters /pl, kl, sp, sk/ in the context of three different vowel heights (high, mid, low). Our results provide evidence for a global organization for the segments involved in these cluster-vowel combinations. This is reflected in a number of ways: compression of the prevocalic consonant and reduction of CV timing in the word-medial cluster case compared to its singleton paired word in both stop-lateral and s-stop clusters, early vowel initiation (as permitted by the clusters' phonetic properties), and presence of compensatory relations between phonetic properties of different segments or intersegmental transitions within each cluster. In other words, we find that the global organization presiding over the segments partaking in these word-medial tautosyllabic CCVs is pleiotropic, that is, simultaneously expressed in multiple phonetic exponents rather than via a privileged metric such as c-center stability or any other such given single measure employed in previous works.},
  language  = {en}
}
@article{GibsonSotiropoulouTobinetal.2019,
  author    = {Gibson, Mark and Sotiropoulou, Stavroula and Tobin, Stephen and Gafos, Adamantios I.},
  title     = {Temporal Aspects of Word Initial Single Consonants and Consonants in Clusters in Spanish},
  series = {Phonetic},
  volume    = {76},
  journal   = {Phonetic},
  number    = {6},
  publisher = {Karger},
  address   = {Basel},
  issn      = {0031-8388},
  doi       = {10.1159/000501508},
  pages     = {448 -- 478},
  year      = {2019},
  abstract  = {We examined gestural coordination in C1C2 (C1 stop, C2 lateral or tap) word initial clusters using articulatory (electromagnetic articulometry) and acoustic data from six speakers of Standard Peninsular Spanish. We report on patterns of voice onset time (VOT), gestural plateau duration of C1, C2, and their overlap. For VOT, as expected, place of articulation is a major factor, with velars exhibiting longer VOTs than labials. Regarding C1 plateau duration, voice and place effects were found such that voiced consonants are significantly shorter than voiceless consonants, and velars show longer duration than labials. For C2 plateau duration, lateral duration was found to vary as a function of onset complexity (C vs. CC). As for overlap, unlike in French, where articulatory data for clusters have also been examined, clusters where both C1 and C2 are voiced show more overlap than where voicing differs. Further, overlap was affected by the C2 such that clusters where C2 is a tap show less overlap than clusters where C2 is a lateral. We discuss these results in the context of work aiming to uncover phonetic (e.g., articulatory or perceptual) and phonological forces (e.g., syllabic organization) on timing.},
  language  = {en}
}
@misc{BrunnerGengSotiropoulouetal.2014,
  author    = {Brunner, Jana and Geng, Christian and Sotiropoulou, Stavroula and Gafos, Adamantios I.},
  title     = {Timing of German onset and word boundary clusters},
  series = {Postprints der Universit{\"a}t Potsdam : Philosophische Reihe},
  journal   = {Postprints der Universit{\"a}t Potsdam : Philosophische Reihe},
  number    = {136},
  issn      = {1866-8380},
  url       = {http://nbn-resolving.de/urn:nbn:de:kobv:517-opus4-399178},
  pages     = {52},
  year      = {2014},
  abstract  = {Previous studies suggest that there are special timing relations in syllable onsets. The consonants are assumed to be timed, on the one hand, with the vocalic nucleus and, on the other hand, with each other. These competing timing relations result in the C-center effect. However, the C-center effect has not consistently been found in languages with complex onsets. Moreover, it has occasionally been found in languages disallowing complex onsets. The present study investigates onset timing in German while discussing alternative explanations (not related to bonding) for the timing patterns observed. Six German speakers were recorded via Electromagnetic Articulography. The corpus contained items with four clusters (/sk/, /kv/, /gl/, and /pl/). The clusters occur in word-initial position, word-medial position, and across a word boundary preceding different vowels. The results suggest that segmental properties (i.e., oral-laryngeal coordination, coarticulatory resistance) determine the observed timing patterns, and specifically the absence or presence of the C-center effect.},
  language  = {en}
}